Air-vent.



- Patented Mar. 25', I902. ALROESCH.

AI R V E N T.

(Application filed May a, 18991 (No Model.)

INVENTOR WITNESSES ATTORNE THE NORRIS pzrzns co. wow-urns" msmnu'rou, I: cv-

NlTED STATES ALFRED ROESCH, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THE DAVIS & ROESCII TEMPERATURE CONTROLLING CO., A CORPORATION OF NEV JERSEY.

AIR-VENT.

SPECIFICATION formingpart of Letters Patent N 0. 695,948, dated March 25, 1902. Application filed May 5,1899. Serial No. 715,708. (No model.)

To aZZ whmn it may concern.- threaded cylindrical portion 9, which receives Be it known that I, ALFRED ROESCH, a citithe inclosing dome or casin g 10, screw-threadzen of the United States of America, and a ed to register therewith, and below'with an resident of Bridgeport, Fair-field county, Conexternally-sorew-threaded cylindrical extennecticut, have invented certain new and usesion 11, to which is fitted a cap or cover 12. 55

ful Improvements in Air-Vents, of which the Reference character 13 designates a holfollowing is a specification. low tube connected at one end with the dis- My invention relates to air-vents for heatcharge-opening 14 and its opposite end closed ing systems, and particularly relates to such and supported in the casting 7. It is subdevices as are adapted to permit the disstantially U-shaped, and in the bend or arch 6o charge of airfrom the system, but which will is provided with an opening, which affords prevent the discharge of the heating medium communication between the interior of the such as steam, therefrom, the discharge of said tube and the dome or casing 10. This liquids of any description-such, forinstance, opening flares outwardly and forms a valve- I 5 as the water of condensation-and shall also seat 15. 65 prevent air returninginto the system through 16 designates a valve-rod having a pointed the device after the steam-supply has been end, which constitutes avalve 17, adapted to cut oil? and the steam in the system shall have engage the valve-seat and close the opencondensed. ing when forced upwardly.

2o Myinvention also relates to a means Where- 18 designates a theromostat, which is more 70 by an air-lock is prevented in such device affully described in detail and claimed in a coter same has been closed temporarily by the pending application of mine filed January 23, action of liquid, whereby the float operated 1899, Serial No. 703,032. Briefly stated, the by the liquid will be allowed to drop after thermostat comprises a plurality of metal the liquid has receded and the valve in said plates, so arranged that under conditions of 75 device he opened. rise of temperature, such as would be caused I will now proceed to describe in detail an by steam impinging upon the thermostatic air-vent embodying my invention and will device, the said plates shall buckle and bear then point out the novel features in claims. against the end of the valve-rod 16, causing Figure 1 represents a portion of a heating same to rise and close the valve-opening, as 80 system provided with an air-vent embodyin above. my invention. Fig. 2 represents a central In the drawings the various parts are shown vertical section through the automatic airas they would be While air was being disvent. charged and before the steam had acted upon 3 5 Similar reference characters designate corthe thermostat to close the valve. 85 responding parts in both figures. 2O designates a diaphragm arranged to close Reference character 3 designates a radiathe lower end of thethermostat-chamber and tor which is a part of a steam-heating system. is held in place between the cap or cover 12 4 is a steam-inlet pipe, which may be proand the cylindrical extension 11. This diavided with a suitable valve, as is usual, and phragm is intended to independently close 0 5 is an exhaust-pipe, which may also be prothe valve 17 when the pressure in the heatvided with a valve. ing system falls below atmospheric pres- 6 designates the air-vent as a whole. It is sure, thus preventing the taking in of air shown clearly in detail in central section, on through the air vent or discharge. The cap an enlarged scale, at Fig. 2. 12 has suitable orifices to allow the atmos- Reference character 7 designates a basepheric air access to the under side of the diapiece consisting of a casting provided at the phragm. rear with a hollow screw-threadeghbo'ss 8, by 19 designates a bell-float with which the which it is connected to thehe'a'ting system, valve-rod 16 is provided andby which the and at the top with an internally-screwsaid valve-rod and valve may be raised to we close the valve-opening should liquid, such as thewater of condensation, rise in theheating system to such a height as to enter the dome or casing. When such action takes place and the valve-opening 15 is closed by the forcing upward of the valve-rod through pressure on the float 19, the said valve might have a tendency to remain closed owing to a suction in the dome or casing 10. I provide means, however, for relieving such suction by afiording communication between the upper end of said dome or casing and the interior of the heating system at a point above the aforesaid connection 8. By this means the valve-rod and float are always ready to drop the moment the level of the liquid falls below the point at which the said float is forced upward thereby, provided, of course, the valve is not being acted upon by the thermostat18 or diaphragm 20. The said communication is illustrated in the drawings by a pipe and coupling connection 21, so arranged that by unscrewing the coupling the dome or casing 10 may be removed for purposes of inspection or repair without having to remove the entire device.

What I claim is- 1. In an air-vent for heating systems, the combination with a tube constituting an airdischarge, of a valve for controlling said discharge, a rod carrying said valve, a thermostat supporting said rod and adapted to raise the rod or permit the rod to lower to correspondingly move the valve under variation in temperature, and a diaphragm adapted to raise and lower said rod independently of said thermostat under variations in pressures.

2. In an automatic air-vent for heating systems, the combination with an air-discharge of a valve adapted to close same, said valve being carried by a valve-rod arranged substantially vertically, and adapted to have a limited longitudinal movement, a thermostat supporting the lower end of said rod and adapted to raise and lower same to close and open the valve under variations in temperature, a diaphragm below said thermostat and adapted to raise and lower said valve-rod to ceases said thermostat and said diaphragm to prevent the passage of liquid, substantially as specified.

3. The combination in an automatic airvent for heating systems, of a casing which is adapted to be in communication with the sys tern, said casing having an air-discharge, of a valve for controlling said discharge, a rod carrying said valve, a float carried by said rod, a thermostat supporting said rod and adapted to raise the rod, or permit the rod to lower to correspondingly move the valve under variation in temperature, and a diaphragm for controlling said valve under variation in pressure.

4. The combination in an automatic airvent for heating systenis,of a casing which is in communication with the heating system, a second communication between the heating system and easing arranged at a higher altitude than the first mentioned communication, a dome for said casing, a tube within said casing in communication with the dome and atmosphere, a valve for controlling the communication between the tube and dome or casing, a thermostat for controlling the valve under variations oftemperatures, and a diaphragm for controlling the valve under variations in pressures.

5. In an automatic air-vent for heating systems,the combination of a casing in communication with said system, a dome carried by said casing and in communication with the casing, a second communication between the heating system and easing arranged at a higher altitude than the first-mentioned communication, a tube located within said dome, and having one end closed and its other end, which is open, in communication with the atmosphere outside of the casing, and said tube also having an opening which forms a communication between the tube and the dome, a valve for controlling said opening, a rod carrying said valve and also a float, and a thermostat provided in the casing and on which said rod rests.

Signed by me at New York this 25th day of April, 1899.

ALFRED ROESOH. Witnesses:

J NO. S. PARKER, J. C. CHAPIN. 

